It's a Big, Big World - Season 2 Episode 6 The Hatch/Sounds of the Forest
Overview: The Hatch: Smooch and Winslow go in search of their eggs after Burdette shows them the egg she hatched from, only to learn later that monkeys don't hatch from eggs. Sounds of the Forest: Wartz moves into a new log, but it proves rather noisy, thanks to mysterious whistling and a knocking sound.